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李香兰; 吕金光; 郑凯丰; 陈宇鹏; 赵百轩; 赵莹泽; 秦余欣; 王惟彪; 梁静秋

doi:10.37188/CO.2023-0063

365彩票官网官方入口

doi: 10.37188/CO.2023-0063

李香兰 ^{1, 2,},
吕金光 ¹,
郑凯丰 ^1,,,
陈宇鹏 ¹,
赵百轩 ¹,
赵莹泽 ¹,
秦余欣 ¹,
王惟彪 ¹,
梁静秋 ^1,,

1.
中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室, 吉林长春 130033
2.
中国科学院大学, 北京 100049

基金项目:国家重点研发计划（No. 2022YFB3604702）；吉林省科技发展计划（No. 20200401056GX）

详细信息

作者简介:
李香兰（1997—），女，吉林长春人，2019年毕业于吉林师范大学，获理学学士学位，现为中国科学院长春光学精密机械与物理研究所研究生。主要从事Micro LED芯片及光学设计方面的研究。E-mail：[email protected]

郑凯丰（1993—），男，吉林长春人，博士，工程师，2021年于中国科学院长春光学精密机械与物理研究所获得博士学位，现为中国科学院长春光学精密机械与物理研究所工程师。主要从事基于Micro LED的光学系统设计、辐射温度测量等方向的研究。E-mail：[email protected]

梁静秋（1962—），女，吉林长春人，博士，研究员，博士生导师，2003年于中国科学院长春光学精密机械与物理研究所获得博士学位，现为中国科学院长春光学精密机械与物理研究所研究员。主要从事微/纳光机电系统及光通信、红外光谱技术及仪器、Micro LED芯片及应用等方面的研究。E-mail：[email protected]

中图分类号:TP394.1;TH691.9
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- 网络出版日期: 2023-07-17

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1.
State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds:Supported by National Key Research and Development Program (No. 2022YFB3604702); Jilin Province Science and Technology Development Plan (No. 20200401056GX)

More Information

Corresponding author: [email protected]; [email protected]

摘要

摘要:
智慧汽车的发展对具备投影功能的智能车灯系统提出了更高的要求。Micro LED投影显示技术因其良好的自发光特性使之与传统技术相比系统结构更为简单，光利用率更高，更有利于小型化、节能化和集成化。本文提出了一种基于Micro LED阵列的车灯投影方案，设计了以像素尺寸为80 μm×80 μm的200×150白光Micro LED阵列作为显示光源，视场角为16°×34°物像倾斜的车灯投影光学系统，对物面倾斜角度和光学系统结构进行了优化。此外，分别采用反向畸变处理方法和像素灰度调制方法解决车灯投影图像的梯形畸变和照度均匀性问题，并搭建了投影实验平台，对图像校正方法进行了验证。实验结果表明：校正后x、y方向的图像梯形畸变系数分别从0.0932和0.3680下降至0.0835和0.0373，像面照度均匀性从83.2%提高到93.2%。本文通过基于Micro LED的倾斜投影车灯光学系统优化设计及其图像校正方法，实现了高光效、低畸变的车灯投影。
- 车灯投影光学系统 /
- 光学设计 /
- Micro LED /
- 照度均匀性 /
- 梯形畸变
Abstract:
The development of smart cars puts forward higher requirements for intelligent light systems with projection functions. Compared with the vehicle light system using traditional technology, the vehicle light system using Micro LED projection display technology can make the system structure simpler and the light utilization rate higher, which is more conducive to miniaturization, energy saving and integration because of its good self-luminous characteristics. In this paper, we propose a light projection scheme based on Micro LED array, design a 200×150 white Micro LED array with a pixel size of 80 μm×80 μm as the display light source and the field of view angle is 16°×34° object image tilt, and optimize the tilt angle and optical system structure of the object surface. In addition, the reverse distortion processing method and the pixel grayscale modulation method are used to solve the problems of keystone distortion and illumination uniformity of the projected image of the vehicle light, and a projection experimental platform is built to verify the image correction method. The experimental results show that the keystone distortion coefficients of the corrected images in the x and y directions decrease from 0.0932 and 0.3680 to 0.0835 and 0.0373, respectively, and the uniformity of the illumination of the image surface increases from 83.2% to 93.2%. In this paper, the optimization design of the oblique projection vehicle lighting system based on Micro LED and its image correction method are used to realize the projection of the vehicle light with high luminous efficiency and low distortion.
- vehicle light projection optical system /
- optical design /
- Micro LED /
- illumination uniformity /
- keystone distortion

HTML全文

图 1 Micro LED车灯投影系统结构示意图

Figure 1. Structural schematic of Micro LED headlight projection system

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图 2 车灯投影示意图

Figure 2. Schematic diagram of headlight projection

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图 3 投影关系示意图

Figure 3. Schematic diagram of the projection relationships

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图 4 车灯投影系统光路图

Figure 4. Optical path diagram of the vehicle light projection system

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图 5 光学系统成像质量评价分析图

Figure 5. Analytical diagram for the evaluation of the imaging quality of the optical system

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图 6 优化后的车灯投影光学系统光路图

Figure 6. Optimized optical path diagram of the headlight projection optical system

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图 7 物面倾斜优化前后MTF曲线

Figure 7. MTF curve before and after object plane tilt optimization

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图 8 不同温度下系统各视场的MTF图

Figure 8. MTF diagram for each field of view of the system at different temperatures

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图 9 图像网格畸变

Figure 9. Image mesh distortion

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图 10 图像对应控制点

Figure 10. Corresponding control points in the image

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图 11 畸变校正流程图

Figure 11. Distortion correction flow chart

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图 12 模拟图像的照度分布

Figure 12. Illumination distribution of the simulated images

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图 13 校正前投影图像

Figure 13. Projected image before correction

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图 14 校正后投影图像

Figure 14. Corrected projected image

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图 15 相机标定分析

Figure 15. Camera calibration analysis

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图 16 原始输出图像的照度分布

Figure 16. Illumination distribution of the original output image

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图 17 校正输出图像的照度分布

Figure 17. Correction of the illumination distribution of the output image

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表 1 车灯投影系统Micro LED阵列参数

Table 1. Parameters for Micro LED arrays for the vehicle light projection systems

指标	参数
像素尺寸/μm	80×80
像素数量	200×150
阵列尺寸/mm	16×12
总光通量/lm	2000

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表 2 投影物镜关键参数及设计指标

Table 2. Key parameters and design specifications for projection objectives

指标	参数
工作波段	400−700 nm
F数	2
视场	16°(V)×34°(H)
焦距	40 mm
MTF	≥[email protected] lp/mm（−20 °C~80 °C）

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表 3 系统公差表

Table 3. Table of system tolerance parameters

参数	值
曲率半径/N	3
表面不规则度ΔN	0.3
厚度/mm	0.02
表面偏心/mm	0.01
表面倾斜/°	0.02
折射率公差	0.001
阿贝数公差	1%
装调偏心/mm	0.03
装调倾斜/°	0.05

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表 4 光学系统公差分析结果

Table 4. Optical system tolerance analysis results

参数	值
名义值	0.720
最佳值	0.725
最差值	0.456
平均值	0.680
标准差	0.060

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表 5 校正前后图像梯形畸变对比

Table 5. Comparison of image trapezoidal distortion before and after correction

梯形畸变系数	校正前	校正后
p₁	0.0932	0.0835
P₂	−0.3680	−0.0373

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